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Finding the Fourth Proportional to 885.51, 1,219.37 and 636.39

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Solution

The fourth proportional to 885.51, 1,219.37 and 636.39 is: 876.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.51 : 1,219.37 = 636.39 : x
  2. Step 2: Convert to fraction form
    885.51/1,219.37 = 636.39/x
  3. Step 3: Cross multiply
    885.51x = 1,219.37 × 636.39
  4. Step 4: Simplify right side
    885.51x = 775,991.69
  5. Step 5: Solve for x
    x = 775,991.69/885.51
  6. Step 6: Final answer
    x = 876.32

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.